cleanup of module001-ch003-core-projects
cleanup of module001-ch003-core-projects

changed to to that
provide changed to plural
added comma after among
removed run on sentence
it changed to They
removed extra spaces

Change-Id: I5256c06b7384df55df38ae90d01cd59f78bae5ec

harrisonfeng/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,openstack/training-guides,openstack/training-guides